adolf fredrik ufger



(No Model.) 2 Shets-Sheet 2.

A.` I'. UNGER. PBBDING MEGHANISM POB. Woon GRINDING MAGHINBS.

No. 524,796. y 'Patented Aug. 2l,` 1894.

Wz'fnesscs; V [z/en/or':

. Q/Wy UNITED STATES PATENT OFFICE.

'ADoLF EREDRIK UNGEE, oF HENEIKsHoLM, SWEDEN.

SPECIFICATION forming part of Letters Patent No.` 524,796, dated August 21, 1894.

. Application filed March 3,1893- Serial No. 464,614. (No model.) l

T aZZ whom it may concern:

Beit known that I, ADOLF FREDRIK UNGER, a subJect of the King of Swedenoand Norway, residing at Henriksholm, Animskog, Sweden, have invented certain new and useful Improvements in Feeding Mechanisms for Wood-Grinding Machines, of which the following is aspecification.

My invention relates to machines for grindlng wood to form pulp, wherein blocks or pieces of wood are held and fed up to a grindst one by means of feeding mechanisms or devlces; and the object of the invention is to provide an improved automatic feeding devlce for the blocks whereby they will be pressed or fed up to the face of the stone in proportion, directly, to the extent of the wearing `away of the blocks by abrasion, asv the feeding up of the blocks is in direct proportion to the speed of the stone, the power for operating the feed being taken from the shaft of the stone. I may say here. that one of the advantages of this mode of operating the feed, is that the pressure per square inch on blocks of different sizes will `always be the same, which is very important as it yields pulp of uniform fineness throughout. In this respect, and in regard to the `facility with which the feeding pressure may be regulated, my improved feeding mechanism is especially advantageous as compared with the ordinary feeding devices used with. this class of machines wherein a weight or hydraulic pressure is employed and with which the feeding pressure is constant, for with this latter mechanism for feeding, the pulp from a large block must inevitably be finer than that from a small one.

I do not claim t-o be the first to adapt this principle to the feeding mechanisms of wood grinding machines but my specific mechanism possesses novel features which will be hereinafter described and carefully defined in the claims. v

In the accompanying drawings I have shown my feeding mechanism applied to a grinding machine which is otherwise of ordinary construction and employs a grindstone revolving in a horizontal plane.

In the drawingsFigure lis a vertical, frag- 5o mentary, mid-section of the machine, and Fig. 2 is a plan or top view of the same. Fig. 3 is a fragmentary end-view of one of the feeding devices, and' Fig. I is a face view and Fig. 4 is asectional view, on a larger scale, illustrating a feature of the invention which will be hereinafter described.

I will first brieliy describe the features of the machine which are now well known.

W is the grindstone, which is fixed on a 6o Vertical shaft C, capable of rotation in a frame or casing W'. This -shaftwill be driveniu the usual, or in any satisfactory manner. Arranged'about the casing W', are the cells, A, in which play the feeding pistons or follo'w- 6: ers, B, which press upon the blocks of wood, X', and feed them up to the stone. Each piston B, has a rod or stem, B', toothed to form a rack, which gears with a pinion P', on a shaft P (see Fig. 3) rotatively mounted on the 70 end-plate of the cell A. On the shaft P, is a spur wheel P2, which gears with a pinion M', 0n a shaft M, also rotatively mounted on the end-plate of the cell.

So far as described the construction is in substance the same as that now in use in some forms of wood grinding machines.

I will now describe my novel mechanism for operating the piston B, to press the block X' up to the stone W, through the medium 3o of an intermittent rotation of the shaft M, premising that, as here indicated, although not fully illustrated, there will be ten cells A arranged about the stone, in five groups of two each, one group being fully illustrated g5 ,in Fig. 2.

On the adjacent ends of the shaft, M, of a pair of feeding devices, are mounted bevel gear wheels, N, and these wheels gear, respectively, with wheels, L, fixed on a shaft, 9o H, which has bearings in a bracket on the casing or frame. Swinging radially on the shaft H, are two arms, G, each of which carries a friction shoe or pawl, K, which engages a groove in a double-grooved friction wheel, 9 5 I, fixed on the shaft H. Ashere shown the wheel I isarranged between the arms G. By rocking these arms alternately, the shaft II will be intermittently rotated in one direction and the two pistons B will be thus-moved inward so as to feed the blocks upto the stone. As the pawls K do not bite and rotate the wheel on the back stroke they will act only on the forward stroke. It will be obvious that these pawls may engage teeth on the wheel if this construction be preferred to the grooves in the wheel.

On thel shaftC of the grindstone are formed two eccentrics D, which are eccentric with each other as well as with the shaft; and embracing these eccentrics, respectively,- aretwo` yokes, E, which latter are coupled respectively, to the pawl arms G, by rods F. Thusy the rotation of the shaft C eects alternate vibrating movements `of @thearms G. I have onlyi shown one pair Vof rods -F in full 'in' Fig. y 2,.butv the fragmentsfof the other pairs ofi' rods show' how the same yoke, E, iscoupled to al1-of Vthe pairsofrodslleadin'g to the-sew` eral pairs offeeding mechanisms about `the stone. In ordert'o regulatel theextent of-vibratory movement impartedto the arm Grt-*by the eccentric and rod, the arm has a slot O, 1n whichis set the coupling pin f, ofthe 'rod- Fi. t Thispin may beset at a-nypoint in th s o When' a pistonf Bis to-fbe withdrawnffor the insertion of a -fresh block of fwo'od, this l maybe'eectd `by-a crank-wheel, Q, on thev shaft 1P; but before" this can be done l it'is necessary to disconnect gearI wheel CN, Afrom its-shaft M, and Vthis 'is` effectedby,` asL herein l shown; thedevice illustrated-on a Vlarge scalev in Fig. 4.

Thewheel Nis mounted looselyon the shaft M, andonlth'ef shaft -is secureda' beveled frictlon pulley or hub, R, which matches-'a'fri tion disk, S, mounted loosely on the" boss-off the hub R. On the disk S is fixed l` an arched? bail, T, through the boss of-which'screwsf'a T-he-aded Vvscrew, U, the vpoint of4 whiohbears 1- on the" hub 1R. By setting this" screwdown firmly,"the` disk; S isr forced into Lfrictional f contacttwitlr the hub, whereby the said disk isfsettorotate with theshaft M. The'disk- S,is within" the hollowoffthe wheel'N, and fin thefsamepla-ne with its overhangin'grim, as clearlyfshown-inthesectional viewat the" righ't'i'n Fig. 4t; andvsecured to theouterpe-V riplieryof -`the diskl S, is a curved leaf` spring, V, the free end of which is furnishedfwith a tooth X, which engages teeth, Y, onh the finner'face` ofv the rim ofsthe wheelN, as clearly shown-.inA theface viewfat the leftin'Fig. 4.-

TlievspringfV'thus connects-f the disk S with the` wheel; N, whereby.` the rotation Y of said disk serves'to-drive:saidwheeLl Now ifV the'` screwfU be 1oosened,theshaftrM-mayrotate fre'ely; during the withdrawal `of the pistony B, .without rotating. the wheel .-N, 1but, itV said l screw b'esrmlyiiset, the' said 'wheel and -shaftz must rotate .ftogethen' This'vdevice for. coupsling: the wheel* N'to its'shaft,or unconplingf it, at will, may as well be applied to some Vother of the toothed wheels than the wheel N, but I find it most convenient to apply 1t to this wheel.

The object in using the spring V as a connecting medium between the wheelN and disk S, in lieu of a rigid connection, is as follows: If the resistance to the'feeding `forward of the piston B should exceed a certain limlt,

whatever may be the cause of such resist-V ance, the spring will yield and allowV the tooth X thereon to slip from one to the other of the teeth Y. The clicking sound thus provducedwarns the operator that something is wrong with the feed and he is thus enabled to stop the machine and remove the obstacle.

It will be obvious that any suitableformv of cam or eccentric'D,` on the shaftO, maybe employed. As4A here shown' this device `is in the nature of arpin,rfixe'dinthe endof the shaft',-this pinfhavingi its-twol superposed sec- `tions turned eccentric to' eachother, and to theportion'lw-hich isuiXed` in the axis-of the shaft. v

The member S of the friction-clutchdevice seenbest-infthensectional view: in--Figu 3, is vherein shown. asfrot-atin-g :onf: the boss vofV the hub R, but it might as well vloe mounted directly, onthe shafty M; This@ will -bereadily understood by l any skilled v meclzianic.n

Having. thusA described myl invention,v I claim- Y v 1. In'a:woodgrinding'machina-the combination with-the stone W, its shaft Gt`nextwo eccentrics fon.` said f shaft, and. their yokes, of"

two `cells A, arranged: side fby'side fandprov-idedA with pistonsv haVin'gfrack-like fstems, the shaftH5a1-rangedf/at'? right-'angles to. the shaft'lC andbetween' the cells of the-:painintermediate gearingibetween the respec-tive'exv tremities of theshaft and:y the'l stems Aof the pistons, the wheel I, iiXed'fon said 'shaftIL' the two pawl-armsG; provided with pawls which. engage the wheelI,- and rods 1 F, -coupledxv re- -spectively'to the arms -Grfa't one-fendsand to the eccentriefyokes at the other'end,vsubstan ,tiallyas set forth.

g .2. Inafwood grindingmachine, the combinationwith ithestone-W and its-shaftG, the piston,- having aL-rack-like-stem', lth'e shaft M,

yand gearing intermediate f therv said; shaft M and the stem-of thefpiston, .of4 the-Wheelc N,

mountedloosely; on they shaftE M, means'sub- {stantiallyasA described for coupling thisfwheel lto its shaft, the shaft H, arranged atzrightangles to the shaft C,.the pinionv L, on.l said lshaft, gearingqwith the wheel'N, andlmeans substantiallyas described: intermediate r the shaftof the stone andY th'ef'shaftaHwhereby the lformer imparts intermittentirotation tothe latter, as set forth. i 3.- In a-wood grinding machina-the combiination lwith `the revolvingfstone :and itsshaft,v

the cell forthe block, the-pistonftherein,,andv

lits'stem, of the-shaftI-I', mechanism interme.`

diate the shaft of the stoney and saidshaft H, for driving the latter, a gear-wheel L on the IOO tro'

shaft H, the shaft M, gearing between said In witness whereof I have hereunto signed shaft M and the stem of the piston for drivmy name in the presence of two subscrlbmg 1o ing the latter, a gear-wheel N, loose on the witnesses. shaft M and gearing with the Wheel L, and

the spring V, frictionally connected with the ADOLF FRBDRIK UNGER' shaft M at one end and provided with a tooth Witnesses: r at the other end which engages teeth on the M. AHLEN, wheel N, substantially as set forth. l G. OLSSON. 

